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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Kononenko, Denys |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Muller, Hermance |
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Kočí, Jan | Prague |
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Šuljagić, Marija |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Rignanese, Gian-Marco |
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Zijlstra, Albert
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (15/15 displayed)
- 2023The heart of Sakurai's Object revealed by ALMAcitations
- 2021Dust Formation in a Primitive Environment
- 2021Dust Formation in a Primitive Environment
- 2020The infrared view of dust and molecules around V4334 Sgr (Sakurai’s Object): a 20-year retrospectivecitations
- 2019Stellar Pulsation and the Production of Dust and Molecules in Galactic Carbon Starscitations
- 2016The Infrared Spectral Properties of Magellanic Carbon Starscitations
- 2016The Infrared Spectral Properties of Magellanic Carbon Starscitations
- 2014The Herschel planetary nebula survey (HerPlaNS): I. Data overview and analysis demonstration with NGC? 6781citations
- 2011The identification of probable SiS emission at 13-14 μm in spectra of galactic S starscitations
- 2009Unusual dust emission from planetary nebulae in the magellanic cloudscitations
- 2008The Magellanic zoo: Mid-infrared Spitzer spectroscopy of evolved stars and circumstellar dust in the Magellanic Cloudscitations
- 2007Luminosities and mass-loss rates of carbon stars in the Magellanic Cloudscitations
- 2007Molecules and dust grains in AGB stars in nearby galaxies - The influence of metallicities
- 2006A Spitzer mid-infrared spectral survey of mass-losing carbon stars in the Large Magellanic Cloudcitations
- 2005An empirical formula for the mass-loss rates of dust-enshrouded red supergiants and oxygen-rich Asymptotic Giant Branch starscitations
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article
The Infrared Spectral Properties of Magellanic Carbon Stars
Abstract
The Infrared Spectrograph on the Spitzer Space Telescope observed 184 carbon stars in the Magellanic<br/>Clouds. This sample reveals that the dust-production rate (DPR) from carbon stars generally increases with<br/>the pulsation period of the star. The composition of the dust grains follows two condensation sequences, with<br/>more SiC condensing before amorphous carbon in metal-rich stars, and the order reversed in metal-poor stars.<br/>MgS dust condenses in optically thicker dust shells, and its condensation is delayed in more metal-poor stars.<br/>Metal-poor carbon stars also tend to have stronger absorption from C2H2 at 7.5 μm. The relation between<br/>DPR and pulsation period shows significant apparent scatter, which results from the initial mass of the star,<br/>with more massive stars occupying a sequence parallel to lower-mass stars, but shifted to longer periods. Accounting<br/>for differences in the mass distribution between the carbon stars observed in the Small and Large<br/>Magellanic Clouds reveals a hint of a subtle decrease in the DPR at lower metallicities, but it is not statistically<br/>significant. The most deeply embedded carbon stars have lower variability amplitudes and show SiC in absorption.<br/>In some cases they have bluer colors at shorter wavelengths, suggesting that the central star is becoming<br/>visible. These deeply embedded stars may be evolving off of the AGB and/or they may have non-spherical dust<br/>geometries.